US20040202872A1 - Hydrophobic surface treatment composition and method of making and using same - Google Patents

Hydrophobic surface treatment composition and method of making and using same Download PDF

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US20040202872A1
US20040202872A1 US10/625,362 US62536203A US2004202872A1 US 20040202872 A1 US20040202872 A1 US 20040202872A1 US 62536203 A US62536203 A US 62536203A US 2004202872 A1 US2004202872 A1 US 2004202872A1
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group
acid
contact angle
hydrophobic
surface treatment
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Jiafu Fang
Roderic Mathews
Marlene Storzer
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Pennzoil Quaker State Co
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Pennzoil Quaker State Co
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Assigned to PENNZOIL-QUAKER STATE COMPANY reassignment PENNZOIL-QUAKER STATE COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATHEWS, RODERIC, STORZER, MARLENE, FANG, JIAFU
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
    • C03C17/30—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/70—Properties of coatings
    • C03C2217/76—Hydrophobic and oleophobic coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane

Definitions

  • the invention is directed to the field of hydrophobic surface treatment compositions and articles made therefrom, including optical component lenses and windows or windshields for automobiles, aircraft, ships, and buildings.
  • Protective coatings capable of imparting high hydrophobicity to a variety of substrates are desirable to reduce exposure or deterioration of the surface.
  • One source of deterioration is moisture.
  • a highly hydrophobic coating may protect the surface by causing water to bead rather than penetrating into the substrate. Beading may also be desirable for aesthetic reasons.
  • Protective coatings typically take the form of water repellent compositions that are applied to a surface of the substrate in liquid form and then allowed to cure. These coatings are typically applied to the surface of the substrate in relatively thick films to form a substantial physical barrier between the environment and the substrate surface. In some instances coatings are colored or colorless depending on the need to preserve the underlying aesthetic features of the substrate. For example, when using a protective coating to protect a wood surface, it is desirable that the coating be clear to preserve the aesthetic features of the wood surface.
  • protective coatings are also needed to protect substrates other than those mentioned above.
  • protective coatings may be desired to protect the surface of objects made from plastic or glass from harmful effects of weather, heat and chemicals.
  • certain protective coatings may not be well suited for providing the desired protection of such materials.
  • Plastic or glass is typically chosen due to a particular aesthetic or functional purpose.
  • glass or plastic materials are commonly used to make windows for homes, buildings, automobiles, or airplanes and the like.
  • Windows are typically installed to separate an indoor environment from an outdoor environment while preserving the ability to view one environment from the other. Accordingly, at least one surface of the window is exposed to elements that are known to cause weather damage and deterioration.
  • Hydrophobic coatings allow water drops to bead, thereby facilitating their movement across a window when a force such as air pressure is applied.
  • Coatings for plastic materials are desirable since plastic is more susceptible to deterioration due to exposure to moisture. Exposure to moisture, whether by accumulation on the surface due to rain, or by other direct contact with water, makes viewing objects through the surface difficult when haziness or other visual distortion occurs.
  • a hydrophobic surface treatment composition is applied to a substrate to form a treated article.
  • a method of manufacturing a treated surface includes applying a hydrophobic surface treatment composition to a substrate having hydroxyl groups on at least one surface and allowing the composition to dry.
  • the hydrophobic surface treatment composition for both embodiments is a mixture or reaction product of a silicone fluid and a solvent.
  • the silicone fluid is an alkyl silane or a polysiloxane having a functional group capable of a condensation reaction with hydroxyl.
  • the functional group is an alkoxy, a hydroxy or an amino group.
  • the hydrophobic surface treatment composition may further include a catalyst or cosolvent.
  • the hydrophobic surface treatment composition is substantially free of external curing agents.
  • the treated surface has a contact angle greater than about 80°.
  • the composition is allowed to dry by evaporation at ambient temperatures. In other embodiments, the composition is allowed to dry by heating.
  • FIG. 1 is a graphical representation of contact angle as a function of wiper cycles.
  • hydrophobic surface treatment compositions and hydrophobic articles made from such compositions.
  • the hydrophobic surface treatment composition comprises a mixture or reaction product of a silicone fluid and a solvent.
  • Some embodiments include a cosolvent or a catalyst or both a cosolvent and a catalyst in the hydrophobic surface treatment composition.
  • Articles that employ such hydrophobic surface treatments include, for example, glass and plastic windows, metal and wood. Methods of making such compositions and articles are also described.
  • the hydrophobic surface treatment composition is substantially free of an external curing agent.
  • the term “substantially free of an external curing agent” means that the hydrophobic surface treatment compositions contains less than about 5 wt. % of an external curing agent. In some embodiments, “substantially free” means less than 3 wt. %, less than 1 wt %, or less than 0.5 wt %.
  • the hydrophobic surface treatment composition is applied to a substrate which has hydroxyl groups or hydrolyzable groups on at least one surface.
  • Suitable substrates include glass, metal, wood, or polymers.
  • the substrate is a windshield of an automobile, airplane, or other vehicle.
  • the hydrophobic surface treatment composition herein is a mixture or reaction product of a silicone fluid, a solvent, a cosolvent, and a catalyst.
  • Suitable silicone fluids include, but are not limited to, polysiloxanes, alkyl silane fluids, or combinations thereof. Any silicone fluid which includes a functional group capable of a condensation reaction with hydroxyl or hydrolyzable groups may be used. The condensation reaction between the hydrophobic surface treatment composition and the substrate may result in a covalent bond between the composition and the substrate.
  • the polysiloxane follows the formula:
  • each R 1 and R 2 is individually selected from the group consisting of hydrogen and substituted or unsubstituted, saturated or unsaturated, alkyl or aryl hydrocarbyl groups having 1 to 40 carbon atoms, and wherein n ranges from greater than 0 to about 150. All R 1 need not be the same. All R 2 need not be the same. At least one R 1 or R 2 is not hydrogen.
  • Some preferred hydrocarbyl groups include methyl, ethyl, propyl, vinyl allyl, and phenyl groups. Other suitable hydrocarbyl groups contain a hydrolyzable functional group.
  • Such hydrolyzable functional groups include alkoxy group or ester derivative groups having 1-40 carbon atoms, such as, for example, methoxy ethoxy groups. Additionally, some hydrocarbyl groups are substituted with a fluoride, chloride, bromide, and iodide.
  • the polysiloxane is a poly dialkyl siloxane, such as polydimethylsiloxane.
  • R 1 or R 2 is an alkoxy, hydroxy or amino functionalized group.
  • At least one R 2 of the polysiloxane is an amino functionalized hydrocarbyl group.
  • Amino functionalized hydrocarbyl groups may have from 1 to about 40 carbon atoms.
  • One particular amino-functionalized hydrocarbyl group is a 1-amino propyl group.
  • the amino functionality need not be a primary amine, for instance, a 2-amino propyl group is also suitable.
  • Another suitable amino-functionalized hydrocarbyl group is the ethyl amino propyl (CH 2 CH 2 CH 2 NHCH 2 CH 2 NH 2 ) group.
  • suitable amino-functionalized hydrocarbyl groups may include other functional groups or may include substituted amino groups such as —CH 2 CH 2 (NHR 3 )CH 2 CH 3 where R 3 is any alkyl or aryl group having from 1-40 carbon atoms.
  • the amino functionality of the silicone fluids discussed above may be reacted with numerous other chemical moieties designed to improve the hydrophobicity and durability of the coating formed from the hydrophobic surface treatment composition. Examples of such compounds include, but are not limited to, for example, long-chain epoxides, isocyanates, and fatty acid derivatives that react with the amino-substituted silicones at appropriate base-equivalent ratios.
  • Suitable polysiloxanes include, but are not limited to, a linear, branched or cyclic polydimethylsiloxane; polysiloxanes having a hydroxyl group in the molecular chain such as silanol-terminated polydimethylsiloxane, silanol-terminated polydiphenylsiloxane, diphenylsilanol-terminated polydimethylphenylsiloxane, carbinol-terminated polydimethylsiloxane, hydroxypropyl-terminated polydimethylsiloxane and polydimethyl-hydroxyalkylene oxide methylsiloxane; polysiloxanes having an amino group in the molecular chain such as bis (aminopropyldimethyl)siloxane, aminopropyl-terminated polydimethylsiloxane, aminoalkyl group-containing, T-structured polydimethylsiloxane, dimethylamino
  • polysiloxanes are commercially available as water repellents, such as Super Rain X formed mainly of polydimethylsiloxane (supplied by Unelko) and Glass Clad 6C formed mainly of polydimethylsiloxane whose terminal groups are replaced with chlorine atom (supplied by Petrarch Systems Inc.).
  • the above polysiloxanes may be used alone or in combination.
  • Other suitable polysiloxanes are those organic polysiloxanes disclosed in U.S. Pat. No. 5,939,491, which is hereby incorporated by reference.
  • the curing agents of U.S. Pat. No. 5,939,491 are not necessary for the hydrophobic surface treatment composition disclosed herein.
  • silicone fluids useful herein have a viscosity at 25° C. ranging from about 1 to about 100,000 cps. Other silicone fluids may have a viscosity outside this range. In some preferred embodiments, the silicone fluid has a viscosity of about 2 to about 50,000 cps. Some other suitable silicone fluids have a viscosity at 25° C. ranging from about 5 to about 10,000 cps. In still other embodiments, the silicone fluid has a viscosity of about 25, about 50, about 100, or about 500 cps. Fluids with a viscosity of about 1000, about 2000, about 5000, or about 7500 cps are also suitable.
  • Suitable alkyl silanes are represented by the following general formula:
  • R 1 is a monovalent hydrocarbon group having 3 to 20 carbon atoms.
  • the following are specific examples of such groups: a propyl group, n-butyl group, pentyl group, n-decyl group, or a similar alkyl group; a cyclohexyl group, or a similar cycloalkyl group.
  • X in the above formula is a hydrolyzable group, preferably a methoxy group, ethoxy group, propoxy group, or a similar alkoxy group. However, X may also be a phenoxy group, a ketooxime group, or an isopropenoxy group.
  • a is an integer having a value of 1 to 3, 1 being preferable.
  • organosilane component examples include n-butyltrimethoxysilane, n-decyltrimethoxysilane, isobutyltrimethoxysilane, n-hexyltrimethoxysilane, and cyclohexylmethyldimethoxysilane.
  • Alkyl silanes of the aforementioned type may be used separately or in a mixture of two or more.
  • the silicone fluid is mixed with a solvent.
  • the solvent is miscible with the silicone fluid.
  • Suitable solvents include, but are not limited to, alkyl or aryl, substituted or unsubstituted alcohols, ethers, esters, or hydrocarbons having between 1 and 40 carbon atoms.
  • the solvent is water.
  • Other solvents have a boiling point ranging from about 100° F. to about 400° F.
  • the solvent has a boiling point ranging from about 150° F. to about 350° F.
  • any solvent that is miscible with the employed silicone fluid may be used.
  • the solvent includes, but are not limited to, methanol, ethanol, isopropanol, or isobutanol.
  • the solvent is 1-propanol, 2-propanol, 1-butanol, 2-butanol, 3-butanol, tert-butyl alcohol, a methyl butanol, a dimethyl butanol, 1-propanol, 2-propanol, 3-propanol, cyclohexanol, phenol, tert-butyl phenol, 2-ethylhexanol, 2-ethoxyethanol, 1-dodecanol, or mixtures thereof.
  • the solvent is an ethylene glycol derivative such as, for example, ethylene glycol, ethylene glycol monobutyl ether and ethylene glycol acetate monoethyl ether, diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether, and diacetone alcohol or the like.
  • the solvent is toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methyl ethyl ketoxime or the like may be used in combination of these solvents.
  • One suitable solvent is a (mono) propylene glycol tertiary butyl ether commercially available as ARCOSOLV® PTB, CAS No. 57018-52-7.
  • Another suitable solvent is propoxy propanol, commercially available as ARCOSOLV® PNP from Lyondell Chemical Company.
  • hydrocarbon solvent any hydrocarbon solvent may be used, particular embodiments employ mineral spirits as the solvent.
  • the hydrocarbon solvent is an isoparaffin solvent, such as ISOPARTM solvents available from the Exxon Chemical Company.
  • the amount of solvent used in preparing compositions can vary. Generally, the amount of solvent used ranges from about 0.5 percent by weight of the composition to about less than 100 percent by weight of the composition. In some embodiments, the solvent comprises about 99.5 percent by weight, about 95 percent by weight, about 90 percent by weight, about 75 percent by weight, or about 50 percent by weight of the composition. In other embodiments, the solvent comprises about 40 percent by weight, about 30 percent by weight, or about 20 percent by weight. In still other embodiments, the solvent comprises about 70 percent by weight to about 85 percent by weight or from about 80 to about 95 percent by weight of the composition. In still other embodiments, the solvent may comprise a smaller or larger fraction of the total composition.
  • a cosolvent it may be present in any convenient amount. If desired, a cosolvent may optionally be used. Suitable cosolvents include those compounds described herein as solvents, namely, alkyl or aryl, substituted or unsubstituted alcohols, ethers, esters, or hydrocarbons having between 1 and 40 carbon atoms and water, but are not limited to them. Typically, in those embodiments where a cosolvent is employed, it will be present in an amount less than the solvent. However, in some embodiments the cosolvent may be present in an amount greater than the solvent. In some embodiments, the cosolvent comprises from greater than 0 percent by weight to about 50 percent by weight of the hydrophobic film composition.
  • the cosolvent preferably comprises from greater than 0 percent by weight to about 20 percent by weight of the hydrophobic film composition. In other embodiments, the cosolvent comprises from greater than about 1 percent by weight to about 15 percent by weight or from greater than 2 percent by weight to about 10 percent by weight of the hydrophobic film composition.
  • a catalyst may optionally be used in some embodiments.
  • the catalyst preferably lowers the activation energy of the reaction between the functional groups of the silicone fluid and the hydroxyl groups on the substrate so that the reaction can occur at ambient temperatures.
  • the catalyst may be a chemical compound or a physical phenomenon such as heat or one or more light frequencies that cause the catalyst to react in the presence of any of the other components of the composition.
  • a catalyst is employed in those embodiments where the silicone fluid is a polysiloxane, especially alkoxy-substituted polysiloxanes.
  • the catalyst is an acid or a metal salt of an organic acid.
  • suitable acids are provided as a solution having a pH below about 6.5.
  • solutions of acids have a pH below about 5.0, about 4.0, or about 3.0 may also be used.
  • Other suitable acid solutions may have a lower pH.
  • the acid may not be in solution form.
  • Some preferred acids include, but are not limited to, acetic acid, sulfuric acid, nitric acid, phosphoric acid, and hydrochloric acid.
  • the metal may be any element of Groups IIB, IIIB, IVB, IIIA, and IVA of the Periodic Table of Elements.
  • the amount of catalyst typically ranges from greater than 0 percent by weight to about 10 percent by weight of the hydrophobic film composition, although amounts outside this range may also be used.
  • the catalyst comprises from greater than 0 percent by weight to about 5 percent by weight of the hydrophobic film composition, or about 0.5 percent by weight to about 1 or about 2 percent by weight of the hydrophobic film composition.
  • the hydrophobic surface treatment compositions may include one or more optional ingredients such as plasticizers, anti-oxidants, light stabilizers, mildewcides and fungicides, surfactants and flow control additives as are well known in the art.
  • the hydrophobic surface treatment composition in some embodiments is substantially free or completely free of any external curing components capable of condensation reactions with the functional groups of the silicone fluid.
  • curing agents include, but are not limited to, aminoplast resins and phenoplast resins and mixtures thereof, polyisocyanates and blocked polyisocyanates, anhydrides, polyepoxides, polyacids, polyols, and polyamines. These agents are more fully described in U.S. Pat. Nos. 3,919,315; 3,919,351; 4,046,729; 4,681,811; 4,732,790; 4,798,746 and 5,468,802, all of which are hereby incorporated by reference.
  • the components are generally mixed together in any order for forming the composition.
  • a reaction occurs upon mixing.
  • the composition comprises a substantially unreacted mixture of the components.
  • the hydrophobic surface treatment composition can be applied to a surface, such as, but not limited to glass, plastics, metal, and wood.
  • the hydrophobic surface treatment composition is applied to a glass or plastic window, such as a windshield of a motorized vehicle.
  • the hydrophobic surface treatment composition may be applied by any suitable method, including wiping or spraying the composition onto the surface.
  • a condensation reaction between the functional groups of the silicone fluid and the hydroxyl or hydrolyzable groups of the substrate bonds the hydrophobic surface treatment composition to the substrate.
  • the composition After being applied to the surface, the composition is allowed to dry, thereby forming a film. In some embodiments, the composition is allowed to dry on the surface at atmospheric conditions.
  • a heat source may be used to dry the composition after it has been applied to the surface.
  • the components of the composition are transformed by a chemical reaction during either the mixing or the drying stages. In other embodiments, the components of the composition remain substantially unreacted during the mixing and drying stages.
  • the components initially used in preparing the hydrophobic surface treatment composition may or may not be present in the film as it exists on the treated surface.
  • the composition After drying, the composition forms a transparent, hydrophobic film on the surface.
  • the hydrophobicity of the treated surface is determined by measuring the contact angle of water droplets on the surface according to ASTM D 5725-99. Generally, reagent water is used in such measurements. Suitable stroke lengths depend on the film composition and can be determined according to Procedure A of ASTM 5725-99. Generally, stroke lengths of from about 0.6 mm to about 2 mm are suitable. Where a surface is tested with more than one drop, the individual drops are separated by at least about 2 cm.
  • the average contact angles for films formed from the compositions described herein range from about 80° to greater than about 1050. In some embodiments, the contact angle is greater than about 85°, 90°, 95°, or 100°. The deviation of the samples from the average is generally about 10%. A higher contact angle is generally indicative of increased hydrophobicity of the film.
  • the films preferably have a relatively high abrasion resistance when applied to a surface.
  • films are durable enough to withstand repeated abrasions of typical automobile windshield wipers.
  • Abrasion resistance was measured by a modification of ASTM D-2486 using an AG-8100 Byk-Gardener Abrasion Tester with a reciprocating linear motion at 37.0+1 cycles per minute with a constant speed over a 10 inch travel.
  • the drive mechanism of the abrasion testing apparatus consists of a gearhead motor driving the motor drive pulley gear. The rotary motion of this gear drives a smaller gear, the chain drive pulley, using a timing belt. The smaller gear drives a set of sprockets and continuous loop mechanism.
  • the cable pair ends are attached to the virtual center of the chain, transforming the rotary motion of the chain into the reciprocating linear motion.
  • Glass substrates were cut to fit the sample holder and treated with the compositions disclosed herein.
  • An ordinary windshield wiper blade was attached to the apparatus to contact the glass at a wiper tension or pressure on the surface of approximately 1.5 oz/inch and operated in a manner simulating actual wiper operation. In operation, one back and forth motion of the wiper blade is considered a “wiper cycle.”
  • the contact angle of water droplets was measured at various stages of the abrasion testing.
  • a hydrophobic surface treatment composition was prepared having about 5.0 percent by weight of a polysiloxane that had a viscosity of about 10 cps at 25° C., about 78 percent by weight of ethanol and about 16 percent by weight of isopropyl alcohol. Acetic acid was added as the catalyst in an amount of about 1.0 percent by weight. The composition was applied to a glass surface and the contact angle of water drop on the surface was 95°.
  • FIG. 1 shows the contact angle as a function of wiper cycles.
  • the compositions withstand at least about 1,000, about 5,000, or about 10,000 wiper cycles before the contact angle of water droplets on the surface falls below 60°.
  • the compositions form a film that is durable enough to withstand more than about 15,000 or more than about 20,000 wiper cycles after which the contact angle of water on the surface of the glass remains at least about 60°.
  • the contact angle of droplets remains about 65°, about 70°, about 75°.
  • the contact angle remains about 800, about 85°, or about 90° after about 5,000, about 10,000, about 15,000, about 20,000 or more wiper cycles.
  • a hydrophobic surface treatment composition was prepared having about 8.5 percent by weight of a polysiloxane that had a viscosity of about 50 cps at 25° C., about 80.0 percent by weight of ethylene glycol monobutyl ether and about 11.0 percent by weight of hydrocarbon solvent (boiling point ⁇ 260° F.). Sulfuric acid was added as the catalyst in an amount of about 0.5 percent by weight. The composition was applied to a glass surface and the contact angle of water drop on the surface was 104°.
  • a hydrophobic surface treatment composition was prepared having about 2.0 percent by weight of a methoxy functionalized polysiloxane that had a viscosity of about 20 cps at 25° C., about 97.4 percent by weight of a hydrocarbon solvent (boiling point ⁇ 320° F.) and about 0.6 percent by weight of acetic acid.
  • the composition was applied to a glass surface and the contact angle of water drop on the surface was 100°.
  • a hydrophobic surface treatment composition was prepared by combining about 0.8 percent by weight of a perfluoroalkyl trichlorosilane with about 99.2 percent by weight of a hydrocarbon solvent (boiling point ⁇ 300° F.) and about 16 percent by weight of isopropyl alcohol. Acetic acid was added as the catalyst in an amount of about 1.0 percent by weight. The composition was applied to a glass surface and the contact angle of water drop on the surface was 103°.
  • a hydrophobic surface treatment composition was prepared by combining about 1% by weight of the composition of Example 5 with about 93.9% by weight isopropyl alcohol, about 5% by weight ethylene glycol monobutyl ether, and about 0.1% by weight of stannous octoate.
  • the hydrophobic composition of Example 5 is then applied to a clean glass plate.
  • the water contact angle of the treated surface is measured 3 hours later after the application to yield a value of 103°.
  • compositions described above provide a convenient source for forming a protective hydrophobic coating that is suitable for application to any number of articles. Moreover, these compositions are easy to apply. While the compositions may be applied to articles and surfaces by spraying, via aerosol or other pressurized or pump type containers, such complicated application means are not necessary. Unlike some other hydrophobic compositions, the compositions described herein may simply be applied with a cloth or other suitable applicator.
  • compositions may include numerous compounds not mentioned herein.
  • the compositions do not include, or are substantially free of, any compounds not enumerated herein.
  • variations and modifications therefrom exist.
  • various additives may also be used to further enhance one or more properties of the compositions and films made therefrom.
  • uses of the compositions are not limited to surface treatments, thus any product benefiting from a hydrophobic composition may be made.
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US20080097065A1 (en) * 2004-02-27 2008-04-24 Molecular Imprints, Inc. Composition for an etching mask comprising a silicon-containing material
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US20090275722A1 (en) * 2003-08-01 2009-11-05 3M Innovative Properties Company Automixable putty impression material
US20090298369A1 (en) * 2006-08-09 2009-12-03 Luna Innovations Incorporated Additive particles having superhydrophobic characteristics and coatings and methods of making and using the same
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